PHP 和 AJAX responseXML 实例
AJAX 可用于以 XML 返回数据库信息。
AJAX Database 转 XML 实例 （测试说明：该实例功能未实现）
在下面的 AJAX 实例中，我们将演示网页如何从 MySQL 数据库中读取信息，把数据转换为 XML 文档，并在不同的地方使用这个文档来显示信息。
本例与上一节中的 "PHP AJAX Database" 这个例子很相似，不过有一个很大的不同：在本例中，我们通过使用 responseXML 函数从 PHP 页面得到的是 XML 形式的数据。
把 XML 文档作为响应来接收，使我们有能力更新页面的多个位置，而不仅仅是接收一个 PHP 输出并显示出来。
在本例中，我们将使用从数据库接收到的信息来更新多个 元素。
在下拉列表中选择一个名字 Select a User: Peter Griffin Lois Griffin Joseph Swanson Glenn Quagmire
此列由四个元素组成：
MySQL 数据库 简单的 HTML 表单 JavaScript PHP 页面数据库
将在本例中使用的数据库看起来类似这样：
| 1 | Peter | Griffin | 41 | Quahog | Brewery |
| 2 | Lois | Griffin | 40 | Newport | Piano Teacher |
| 3 | Joseph | Swanson | 39 | Quahog | Police Officer |
| 4 | Glenn | Quagmire | 41 | Quahog | Pilot |
HTML 表单
上面的例子包含了一个简单的 HTML 表单，以及指向 JavaScript 的链接：
<html><head><script src="responsexml.js"></script></head><body><form> Select a User:<select name="users" onchange="showUser(this.value)"><option value="1">Peter Griffin</option><option value="2">Lois Griffin</option><option value="3">Glenn Quagmire</option><option value="4">Joseph Swanson</option></select></form><h2 id="span-id-firstname-span-nbsp-span-id-lastname-span"><span id="firstname"></span> <span id="lastname"></span></h2><span id="job"></span><div style="text-align: right"><span id="age_text"></span><span id="age"></span><span id="hometown_text"></span><span id="hometown"></span></div></body></html>
换句话说，每当用户在下拉列表中改变了值，函数 showUser() 就会执行，并在指定的 元素中输出结果。
JavaScript
这是存储在文件 "responsexml.js" 中的 JavaScript 代码：
var xmlHttpfunction showUser(str) { xmlHttp=GetXmlHttpObject() if (xmlHttp==null) { alert ("Browser does not support HTTP Request") return } var url="responsexml.php" url=url+"?q="+str url=url+"&sid="+Math.random() xmlHttp.onreadystatechange=stateChanged xmlHttp.open("GET",url,true) xmlHttp.send(null) }function stateChanged() { if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){ xmlDoc=xmlHttp.responseXML; document.getElementById("firstname").innerHTML= xmlDoc.getElementsByTagName("firstname")[0].childNodes[0].nodeValue; document.getElementById("lastname").innerHTML= xmlDoc.getElementsByTagName("lastname")[0].childNodes[0].nodeValue; document.getElementById("job").innerHTML= xmlDoc.getElementsByTagName("job")[0].childNodes[0].nodeValue; document.getElementById("age_text").innerHTML="Age: "; document.getElementById("age").innerHTML= xmlDoc.getElementsByTagName("age")[0].childNodes[0].nodeValue; document.getElementById("hometown_text").innerHTML="<br/>From: "; document.getElementById("hometown").innerHTML= xmlDoc.getElementsByTagName("hometown")[0].childNodes[0].nodeValue; }}function GetXmlHttpObject() { var objXMLHttp=null if (window.XMLHttpRequest) { objXMLHttp=new XMLHttpRequest() } else if (window.ActiveXObject) { objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP") } return objXMLHttp }showUser() 与 GetXmlHttpObject 函数与 PHP 和 AJAX MySQL 数据库实例 这一节中的例子是相同的。您可以参阅其中的相关解释。
stateChanged() 函数如果选择了下拉列表中的项目，该函数执行：
通过使用 responseXML 函数，把 "xmlDoc" 变量定义为一个 XML 文档 从这个 XML 文档中取回数据，把它们放在正确的 "span" 元素中PHP 页面
这个由 JavaScript 调用的服务器页面，是一个名为 "responsexml.php" 的简单的 PHP 文件。
该页面由 PHP 编写，并使用 MySQL 数据库。
代码会运行一段针对数据库的 SQL 查询，并以 XML 文档返回结果：
<?phpheader('Content-Type: text/xml');header("Cache-Control: no-cache, must-revalidate");//A date in the pastheader("Expires: Mon, 26 Jul 1997 05:00:00 GMT");$q=$_GET["q"];$con = mysql_connect('localhost', 'peter', 'abc123');if (!$con) { die('Could not connect: ' . mysql_error()); }mysql_select_db("ajax_demo", $con);$sql="SELECT * FROM user WHERE id = ".$q."";$result = mysql_query($sql);echo '<?xml version="1.0" encoding="ISO-8859-1"?><person>';while($row = mysql_fetch_array($result)) { echo "<firstname>" . $row['FirstName'] . "</firstname>"; echo "<lastname>" . $row['LastName'] . "</lastname>"; echo "<age>" . $row['Age'] . "</age>"; echo "<hometown>" . $row['Hometown'] . "</hometown>"; echo "<job>" . $row['Job'] . "</job>"; }echo "</person>";mysql_close($con);?>当查询从 JavaScript 送达 PHP 页面时，会发生：
PHP 文档的 content-type 被设置为 "text/xml" PHP 文档被设置为 "no-cache"，以防止缓存 用 HTML 页面送来的数据设置 $q 变量 PHP 打开与 MySQL 服务器的连接 找到带有指定 id 的 "user" 以 XML 文档输出数据
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